Self-operated Pressure Regulators for special applications

Transcription

1 Self-operated Pressure Regulators for special applications Type Pressure Regulator Pressure build-up regulator Valve opens when the upstream pressure drops Pressure reducing valve Valve closes when the downstream pressure rises Type Excess Pressure Valve Valve opens when the upstream pressure rises pplication Pressure regulators for cryogenic gases and liquids as well as other liquids, gases and vapors Operating pressures up to 63 bar Set point ranges from 1 to 40 bar Temperatures from 200 to +200 C Oxygen clean according to international standards and guidelines Industrial gases (such as argon, nitrogen and oxygen) are stored in a liquefied condition at extremely low temperatures and at a constant pressure in thermally insulated tanks. Pipes transport the medium to the consumer. The extreme operating conditions (pressures up to 50 bar and temperatures down to 200 C) require the use of special valves. The Series 235 Pressure Regulators are especially designed for the conditions in cryogenic service. These regulators can also be used for gases, liquids and vapors under other operating conditions. Special features Low-maintenance proportional regulators requiring no auxiliary energy Wide set point range and convenient set point adjustment Rugged design and low overall height Cleaned and packed for oxygen service 1) Versions The pressure regulators consist of a valve body, operating diaphragm and set point adjuster. Type Pressure uild-up Regulator with safety function The upstream pressure is transmitted to the operating diaphragm. The valve opens when the upstream pressure falls below the adjusted set point. Direction of flow from port to port. Safety function: the plug in the pressure build-up regulator operates like a safety valve and relieves the pressure chamber of pressure. The pressure acts on the plug from below. The valve opens to equalize the pressures. Type Pressure Reducing Valve The valve regulates the downstream pressure to the adjusted set point. The valve closes when the downstream pressure rises. Direction of flow from port to port. 1) The regulators are not approved for oxygen service according to EIG 13/02/E due to the use of thin-walled components made of CrNi steel Fig. 1: Type Pressure Regulator/Type Excess Pressure Valve Type Excess Pressure Valve The valve regulates the upstream pressure to the set point adjusted at the set point adjuster. The valve opens when the pressure increases until the set point is reached. Direction of flow from port to port. The regulator is additionally equipped with an integrated nonreturn unit that prevents the medium from flowing back. ssociated Information Sheet u T 2500 Edition February 2014 Data Sheet T 2560 EN

2 Special versions (details on request) Type and Type Pressure Regulators Version for liquid hydrogen and flammable gases ccessories Coupling nut and ball-type bushing with welding nipple for 21.3x1.6 mm pipe diameter Coupling nut and ball-type bushing with flanges Other accessories in Data Sheet u T 250. Principle of operation Ports and are marked on the valve body. Functioning as a Type Pressure uild-up Regulator (Fig. 2) with direction of flow from port to port, the pressure upstream of the valve (port ) is transmitted to the operating diaphragm. The valve closes when the upstream pressure increases and opens when the upstream pressure decreases. The pressure build-up regulator operates as a safety valve and relieves the pressure chamber of pressure when the pressure exceeds the set point by 5 bar. fter overcoming the force of the top plug spring (16), the valve opens to equalize the pressures. The valve is open when no pressure is applied. The pressure downstream of the valve (port ) is transmitted to the operating diaphragm (3). The positioning force produced moves the valve plug (2.1) depending on the spring force adjustable at the set point adjuster (10). The valve closes when the pressure downstream of valve (port ) increases. The medium flows through the Type Excess Pressure Valve (Fig. 3) from port to port. The valve is closed when no pressure is applied. The pressure at port is transmitted internally to the operating diaphragm (3). The positioning force produced opposes the adjustable spring force. The valve opens when the pressure increases until the set point is reached. The integrated non-return unit prevents the medium from flowing back. Installation Type Pressure uild-up Regulator (Pressure Reducing Valve) Standard mounting position with the spring housing suspended downward. Other mounting positions on request. uild-up pressure regulator: direction of flow from port to port Pressure reducing valve: direction of flow from port to port Type Excess Pressure Valve with with non-return unit Installation in horizontal pipelines Direction of flow from port to port Spring housing facing downward EC type examination n EC type examination according to the Pressure Equipment Directive 9/23/EC, Module has been performed on the regulators Fig. 2: Type Pressure uild-up Regulator or Pressure Reducing Valve Pressure build-up regulator Pressure reducing valve Direction of flow Fig. 3: Type Excess Pressure Valve Valve body 10 Set point adjuster (hex socket, SW 5) 2.1 Plug 11 Lock nut (SW 1) 3 Operating diaphragm 12 Integrated non-return unit 4.1 Seal (bottom section of body) 14 ody screws 5 Diaphragm plate 15 Seat 6 all 16 Plug spring Spring plate 8 Set point springs 9 ottom section of body (spring housing) 2 T 2560 EN

4 Flow capacity of the regulator dependent on the liquid column in the cryogenic tank The value table and the mass flow diagram show the flow capacity of the media nitrogen (N 2 ), oxygen (O 2 ), argon (r), carbon dioxide (CO 2 ) and natural gas (LNG). The specifications apply to the Type Pressure uild-up Regulator installed in the liquid phase of the pressure build-up control loop; as shown in Fig. 4 (typical application). The maximum flow capacity [kg/h] of the regulator arises from the liquid level [m] of the medium in the tank and can be determined from the graph. The data in the graph are based on theoretical calculations which do not take factors, such as pressure losses in the pipeline, into account. Therefore, the real flow capacity may deviate from the calculated value. Table 3: Mass flow dependent on the liquid column in the cryogenic tank Filling level [m] Mass flow rate [kg/h] N 2 O 2 r CO 2 LNG kg h 1600 r Flow rate CO2 O2 N LNG [m] Filling level Fig. 5: Mass flow dependent on the liquid column in the cryogenic tank 4 T 2560 EN

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